Failure to update on 19.07.7 with luci and cli command

Luci error:

Error connecting to upgrade server
Could not reach API at "https://sysupgrade.openwrt.org". Please try again later.
SyntaxError: JSON.parse: unexpected end of data at line 1 column 1 of the JSON data

auc error:

auc (0.1.4)
requesting:
{
"distro": "OpenWrt",
"target": "ath79/generic",
"version": "19.07.7",
"revision": "r11306-c4a6851c72",
"installed": {
"terminfo": "6.1-5",
"luci-proto-wireguard": "git-21.069.16534-310f532-1",
"iwinfo": "2019-10-16-07315b6f-1",
"liblucihttp0": "2019-07-05-a34a17d5-1",
"cgi-io": "19",
"libc": "1.1.24-2",
"opkg": "2021-01-31-c5dccea9-1",
"kmod-usb-core": "4.14.221-1",
"luci-app-opkg": "git-21.044.30835-34e0d65-1",
"wpad-basic": "2019-08-08-ca8c2bd2-5",
"libpthread": "1.1.24-2",
"ubus": "2019-12-27-041c9d1c-1",
"iw": "5.0.1-1",
"libuci20130104": "2019-09-01-415f9e48-4",
"rpcd": "2020-05-26-67c8a3fd-1",
"busybox": "1.30.1-6",
"luci-lib-ip": "git-21.044.30835-34e0d65-1",
"libubus-lua": "2019-12-27-041c9d1c-1",
"kmod-nf-reject6": "4.14.221-1",
"libiwinfo-lua": "2019-10-16-07315b6f-1",
"swconfig": "12",
"libubus20210603": "2022-02-21-b32a0e17-1",
"luci-mod-system": "git-21.044.30835-34e0d65-1",
"kmod-nf-flow": "4.14.221-1",
"kmod-lib-crc-ccitt": "4.14.221-1",
"getrandom": "2019-06-16-4df34a4d-3",
"luci-theme-bootstrap": "git-21.044.30835-34e0d65-1",
"kmod-pppoe": "4.14.221-1",
"libcap": "2.27-1",
"kmod-pppox": "4.14.221-1",
"luci-app-wireguard": "git-21.069.16534-310f532-1",
"kmod-ipt-conntrack": "4.14.221-1",
"kmod-nf-reject": "4.14.221-1",
"base-files": "204.2-r11306-c4a6851c72",
"kmod-nf-nat": "4.14.221-1",
"libpcre": "8.43-1",
"netifd": "2021-01-09-753c351b-1",
"kmod-ipt-raw": "4.14.221-1",
"ddns-scripts": "2.7.8-13",
"uboot-envtools": "2018.03-3.1",
"dnsmasq": "2.80-16.3",
"procd": "2020-03-07-09b9bd82-1",
"kmod-phy-ath79-usb": "4.14.221-1",
"libuclient20160123": "2020-06-17-51e16ebf-1",
"ubusd": "2019-12-27-041c9d1c-1",
"qrencode": "4.0.2-2",
"libelf1": "0.177-1",
"screen": "4.8.0-2",
"kmod-usb-ehci": "4.14.221-1",
"luci-mod-status": "git-21.044.30835-34e0d65-1",
"libxtables12": "1.8.3-1",
"libiwinfo20181126": "2019-10-16-07315b6f-1",
"libmbedtls12": "2.16.12-1",
"luci-app-ddns": "2.4.9-7",
"kmod-usb2": "4.14.221-1",
"firewall": "2019-11-22-8174814a-3",
"kmod-ath10k-ct-smallbuffers": "4.14.221+2019-09-09-5e8cd86f-1",
"luci-app-firewall": "git-21.044.30835-34e0d65-1",
"kmod-ipt-conntrack-extra": "4.14.221-1",
"kmod-nf-ipt": "4.14.221-1",
"luci-lib-ipkg": "git-21.069.16534-310f532-1",
"libmnl0": "1.0.4-2",
"tc": "5.0.0-2.1",
"tcpdump": "4.9.3-2",
"kmod-ip6tables": "4.14.221-1",
"odhcp6c": "2021-01-09-64e1b4e7-16",
"fstools": "2020-05-12-84269037-1",
"kmod-udptunnel4": "4.14.221-1",
"uclient-fetch": "2020-06-17-51e16ebf-1",
"kmod-udptunnel6": "4.14.221-1",
"kmod-ath9k": "4.14.221+4.19.161-1-1",
"iptables-mod-ipopt": "1.8.3-1",
"uci": "2019-09-01-415f9e48-4",
"lua": "5.1.5-3",
"nmap": "7.70-1",
"libip4tc2": "1.8.3-1",
"libubox20191228": "2020-05-25-66195aee-1",
"dropbear": "2019.78-2",
"kmod-hwmon-core": "4.14.221-1",
"luci-compat": "git-21.069.16534-310f532-1",
"rpcd-mod-file": "2020-05-26-67c8a3fd-1",
"mtd": "24",
"odhcpd-ipv6only": "2020-05-03-49e4949c-3",
"mtr": "0.93-1",
"ath10k-firmware-qca988x-ct": "2020-07-02-1",
"rpcd-mod-luci": "20201107",
"luci-app-sqm": "1.4.0-2",
"urandom-seed": "1.0-1",
"luci-proto-ppp": "git-21.044.30835-34e0d65-1",
"luci-mod-admin-full": "git-21.044.30835-34e0d65-1",
"ppp": "2.4.7.git-2019-05-25-3",
"luci-base": "git-21.044.30835-34e0d65-1",
"kmod-gpio-button-hotplug": "4.14.221-3",
"logd": "2019-06-16-4df34a4d-3",
"kmod-wireguard": "4.14.221+1.0.20200611-2",
"kmod-mac80211": "4.14.221+4.19.161-1-1",
"wireguard-tools": "1.0.20191226-1",
"libjson-script": "2020-05-25-66195aee-1",
"luci-proto-ipv6": "git-21.044.30835-34e0d65-1",
"libblobmsg-json": "2020-05-25-66195aee-1",
"libip6tc2": "1.8.3-1",
"iptables": "1.8.3-1",
"openwrt-keyring": "2019-07-25-8080ef34-1",
"luci-app-attendedsysupgrade": "git-22.115.68448-712bc8e-1",
"sqm-scripts": "1.4.0-2",
"jshn": "2020-05-25-66195aee-1",
"kmod-ipt-core": "4.14.221-1",
"attendedsysupgrade-common": "0.2-1",
"ca-certificates": "20200601-1",
"kmod-ppp": "4.14.221-1",
"libncurses6": "6.1-5",
"ip-tiny": "5.0.0-2.1",
"libpcap1": "1.9.1-2.1",
"libjson-c2": "0.12.1-3.1",
"uhttpd": "2020-10-01-3abcc891-1",
"auc": "0.1.4-1",
"kmod-nf-conntrack": "4.14.221-1",
"iptables-mod-conntrack-extra": "1.8.3-1",
"usign": "2020-05-23-f1f65026-1",
"ip6tables": "1.8.3-1",
"liblua5.1.5": "5.1.5-3",
"zlib": "1.2.11-3",
"kmod-nf-ipt6": "4.14.221-1",
"luci-lib-nixio": "git-21.044.30835-34e0d65-1",
"rpcd-mod-rpcsys": "2020-05-26-67c8a3fd-1",
"iptraf-ng": "1.1.4-1",
"liblucihttp-lua": "2019-07-05-a34a17d5-1",
"luci-lib-jsonc": "git-21.044.30835-34e0d65-1",
"kmod-ipt-ipopt": "4.14.221-1",
"luci": "git-21.044.30835-34e0d65-1",
"kmod-nf-conntrack6": "4.14.221-1",
"libgcc1": "7.5.0-2",
"libstdcpp6": "7.5.0-2",
"libqrencode": "4.0.2-2",
"kmod-ath": "4.14.221+4.19.161-1-1",
"ubox": "2019-06-16-4df34a4d-3",
"kmod-sched-cake": "4.14.221+2019-03-12-057c7388-1",
"kernel": "4.14.221-1-b84a5a29b1d5ae1dc33ccf9ba292ca1d",
"libnl-tiny": "0.1-5",
"libubus20191227": "2019-12-27-041c9d1c-1",
"rpcd-mod-iwinfo": "2020-05-26-67c8a3fd-1",
"luci-mod-network": "git-21.044.30835-34e0d65-1",
"kmod-ifb": "4.14.221-1",
"kmod-nls-base": "4.14.221-1",
"uhttpd-mod-ubus": "2020-10-01-3abcc891-1",
"fwtool": "2",
"jsonfilter": "2018-02-04-c7e938d6-1",
"ucert-full": "2020-05-24-00b921d8-1",
"hostapd-common": "2019-08-08-ca8c2bd2-5",
"iperf3": "3.7-1",
"kmod-ipt-offload": "4.14.221-1",
"kmod-ath9k-common": "4.14.221+4.19.161-1-1",
"wireless-regdb": "2020.11.20-1",
"urngd": "2020-01-21-c7f7b6b6-1",
"kmod-slhc": "4.14.221-1",
"kmod-cfg80211": "4.14.221+4.19.161-1-1",
"libustream-mbedtls20150806": "2020-03-13-40b563b1-1",
"rpcd-mod-rrdns": "20170710",
"ppp-mod-pppoe": "2.4.7.git-2019-05-25-3",
"kmod-ipt-nat": "4.14.221-1",
"kmod-sched-core": "4.14.221-1",
"arp-scan": "1.9.5-1"
},
"upgrade_packages": 1
}
headers:
{
"access-control-allow-headers": "",
"access-control-allow-methods": "POST, GET, OPTIONS",
"access-control-allow-origin": "",
"content-length": "205",
"content-type": "application/problem+json",
"date": "Thu, 29 Sep 2022 01:37:03 GMT",
"server": "Caddy",
"server": "gunicorn"
}
HTTP error 404
reply:
{

}
server reply invalid.
running OpenWrt 19.07.7 on ath79/generic (dlink,dir-859-a1)
checking https://sysupgrade.openwrt.org for release upgrade or updated packages

Start with the auc request to https://sysupgrade.openwrt.org for OpenWrt 19.07.7 on ath79/generic and compare the reported HTTP 404 response with the ASU service behavior. Trace the Python/Flask API entry point handling this request; done means the upgrade request returns a valid response instead of an empty problem document.